Question

Which statements describe continental crust? Select the three correct answers (apex)

A. It is formed at some of volcanic activity on the ocean floor

B. It is between 25 and 70 km thick

C. It is made of all types of rocks

D. It contains silicate minerals high in sodium, potassium, aluminum and calcium

E. It is relatively young (less than 180 million years old)

Answer 1

Answer: Option (B), (C) and (D)

Explanation: Continental crust is a thick plate that comprises of sedimentary, metamorphic and igneous types of rocks. They are less denser compared to the oceanic crust and usually have a thickness of about 35-40 km, and increases upto 75-80 km at the mountain ranges. It often contains silicate minerals, that are mainly enriched in sodium, aluminium, calcium and potassium.

Thus, the correct options are mentioned above.

Answer 2

B, C, D

Step-by-step explanation:

The following statements are true regarding the continental crust;

It is between 25 and 70 km thick

Its made of all types of rocks

It contains silicate minerals high in sodium, potassium, aluminum, and calcium